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@geiten tstcsgatm @Him Letters Patent No. 76,958, lated April 21, 1868..

IMPROVEMENT IN DIES EOE MAKING CLOCK-COLLETS.

@In tlgehah rrfemt it in tlgesr ntrattati liteut mit mating inurl at tige sante.

TO ALL WHOM IT MAY CONCERN;-

Be it knon'rn that I, HIRAM C. THOMPSON, of Bristol, in the county of Hartford, Stdte of Connecticut, have invented a new and'improved Double Die and Punch for Punching Glock-eCollcts, die., and I do'her'eby declare that the following is a full, clear, and exact description thereof, 'which will 'enable othersskilled in theart to make and use the same, reference beingrhad to the accompanying drawings, making `a. part of this specication, in which-el Figure 1 is a perspective view of my invention.

Similar letters of reference indicate like parts.

My invention consists, iirst, in making the distance between the circumference of thel larger die andthe centre of the smaller die equal to a small fraction (say about Vone-hundredthgo'ffan inch) over half the diameter of the larger die; second, in placing the front of 4the gauge-pin nearly parallel avith'the centre of'both dies, in order that its front may serve as a guide to the metal after 'it has passed the dies,- while its en'd serves for a stop; third, in placing the left-hand end of the back gauge nearly back of the centre of the'larger die, in order to give the scrap room to part from the metal being pressed. I' l The metal, B, in fig. 1, covers the two dies E c, but their position is shown by the brolien lines. n'constructing this double die and punch, it is very necessary that the two dies E c areof'thedistance from each otherabove described, or, Ain other Words, placed atpsuchV a distancefrom each other that as each collet is pressed, the scrap A will part from the metal B, `-while the collets will be punched full sizeand shape of the larger die E:

The gaugepin F is mademuch longer than -the ordinary lgauge-pin, and of knife-edge form. .Its end is placed us near the larger die E as possible, 'without having it come -in contact with. thelnrger punch C. The back gauge G is same as ordinary gauge, .with the exception that it is placed further to the right, in orderithat its left end need not be in the way of the scrap A'.` v

The dies and gaugesare covcredwith a picker, or rtake-oli` of the ordinary style, but not shown in the draw ings. The gaugepin F canbefastened either to the take-oit or die, as desired..

The punches C c for this die are constructed the same as an ordinary'doublepunch, thelarger one, C, pro. vided with a pointed centre, D, the body of which will lill the Vhole punched by lthe smaller die e and punch c.

ATo usethis die and punch, place the metal, B, against the gauge Gr, and then move itto the left until it is partly under the larger die E, and let the punches C c descend, when a hole will be punched with the smaller die e and punch c, and part of a collet will be punched with the die E and punch C. 'Then movethe metal, B, to the left `until the place in it'from which the half collet was pressed comes vin contactyvith the gauge-pin-F 'As the punches C c againdescend, Athe pointed centre D ofthe punch' enters the hole just pressed, land brings' it central with the larger' die E, and then punches collet, as well as auother'snnavll hqle. The left-hand end of the metal, B, parts enough to admit the end of the gauge-pin F, and is then passedalcng again, dto.

The scrap A forms back ofthe gauge-pin F,'\'vhile the metal, Bis gudednot'only by the gauge'G, but also by the front of the gauge-pin F, as shown in tig. 1.

The'ordinary mode of making eellets for clocks is to punch thern with a' single dieand punch, and aftet wards drill the centre hole.

Doubledies and punches are used in clock-shops and others for punching thin Inetahand are generally made as follows: rlhe two dies are left at such a distanceA from each-,other that the scrapemains Whole. TheAv gauge-pin is less in length than the diameter-of the largersdielv After one article is. pressed-,fthe metal is raised over the gauge-pin and dropped again with) the gauge-pin in tl'iehole'i-in the metal from whichf the `article was pressed. i i

Ii" a back-gauge'isused, it extends about equal distances each way from'the centree-f the' dies, and 'the metal must either be only wide enough for two rows of articlesto be'` pressed from it, or, afterpressing a row on each edge, the gauge must he moved back or'the metal trimmed. Sometimes 'the `back gaugeis' dispensed with, and the metal guided by hand. g Then more-than two-.rows can be pressed from one-piece, but it involvesH a. great Waste of stock.

By my inveutionI produce a double die and punch which is cupbleof doing much finer and better work than uny other, thereby bringing it into use whereno other can be used. Livingfas I do, in-a vicinity where clocksare largely made? .I can safely say that it is the onlyl double die and punch that has ever been success-A A fully used for punching clock-collets, whereas I have used mine for nearly two'years, and thereby thoroughly utested it.

on the base-plate, substantiallyl as described.

The labor of making clock-collets by my invention'will cost only about three cents per thousand, whexjens by the ordinary mode it costs twenty cents per thousand. l The same proportion of labor will also-be saved in pressing 'many other articles.y 4

I do not claim a double die and punch of any construction, neither do I claim the take-oi or method of securing the gauges in their places; but

4 What I doclaim as new, and desire to secure by Letters Patent, is-n The combination and arrangement of the dies E @gauge-pin F, `and back gauge G, arranged and operating HIRAM C. THOMPSON.

'Witnesses Gunner: W. ATKINS; JAMES -SHEPARIL 

